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What would be a line that is perpendicular to y=x?

I thought it y=-x+6 but don't no how to work it out

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"don't no how to work it out"
 
know, not no.

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Steve S. | Tutoring in Precalculus, Trig, and Differential CalculusTutoring in Precalculus, Trig, and Diffe...
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You're right! y = - x + 6 IS ⊥ to y = x.
 
Why? Check this out: